The causal organism of damping-oil disease of okra is a?
A. bacterium B. virus C. nematode D. aphid E. fungus Correct Answer: Option E - fungus
Which of the following is not a reason for the government to encourage the planting of trees?
A. controlling erosion B. increasing soil fertility C. preventing desert encroachment D. reducing effects of environmental pollution E. increasing output of mineral oil Correct Answer: Option E - increasing output of mineral oil
If the ginning percentage of the samaru variety of cotton is 35, what will be the amount of raw cotton obtained from a 6 hectare farm with a yield of 330 kg seed cotton per hectare?
A. 46 kg B. 96.3 kg C. 114 kg D. 693 kg E. 6930 kg Correct Answer: Option E - 6930 kg
Most crop plants do not survive in water-logged soils because?
A. the dissolved nutrients are too diluted for crop plants B. the plants will not photosynthesize C. their leaves are turgid for respiration D. their physiological processes will be increased E. oxygen has been displaced to its deficiency for crops Correct Answer:...
Plant micro-nutrients include the following except?
A. sulphur B. copper C. iron D. zinc E. chlorine Correct Answer: Option A - sulphur
Which of the following factors does not bring about soil formation?
A. climate B. time C. parent material D. sunshine E. topography Correct Answer: Option D - sunshine
A soil with particles of less than 0.002mm in diameter is referred to as?
A. clay B. silt C. sand D. gravel E. humus Correct Answer: Option A - clay
Fertilizers that usually contain one nutrient which can be used directly by plants are commonly called?
A. organic fertilizers B. mixed fertilizers C. inorganic fertilizers D. compound fertilizers E. straight fertilizers Correct Answer: Option E - straight fertilizers
The different types of soil are determined by the relative amounts of each of the following components except?
A. rocks B. air C. water D. minerals E. organic matter Correct Answer: Option A - rocks